Method of building a bridge construction



Nov. 8, 1960 J. P. MURPHY METHOD OF BUILDING A BRIDGE CONSTRUCTION FiledJan. 23, 1956 5 Sheets-$heet 1' WEI //4 m /3 m 23 p -:1 Z3

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Nov. 8, 1960 J. P. MURPHY METHOD OF BUILDING A BRIDGE cous'muc'rxonFiled Jan. as, 1956 5 Sheets-She'et 5 IN V EN T 0R. Ja/nv pHIL/P Mum-w Y1 zvllllllfllllld NIETHOD OF BUILDING A BRIDGE CONSTRUCTION John PhilipMurphy, Piedmont, Calif., assignor, by mesne assignments, to YubaConsolidated Industries, Inc., San Francisco, Calif., a corporation ofDelaware Filed Jan. 23, 1956, Ser. No. 560,678

Claims. (Cl. 29-431) This invention relates generally to a method ofbuilding a bridge construction and more particularly to a method andapparatus for assembling and erecting eyebar assemblies in bridges ofthe cantilever type.

In cantilever bridges or spans it is often common prac tice for upperchord members that are in tension to be made up of a plurality oflaterally spaced eyebars to form a laminated type of construction.Heretofore, the eyebars have been put in place one by one. This methodof assembling the eyebars has been found to be particularly difiicultbecause of the great length and extreme flexibility of the individualeyebars. The weight of the individual eyebars also makes them difficultto handle. It also has been found that the eyes in the eyebars arefrequently out of alignment making it difficult to force the pinsthrough the eyebars. This is particularly disadvantageous because thepin connections must be made at a considerable distance above the waterwithin a limited working area, and with a minimum of equipment.

In general, it is an object of the present invention to provide a methodof building a bridge construction in which the eyebars are readilyassembled into eyebar assemblies prior to field erection and thecompleted eyebar assemblies placed in position in the cantilever span toeliminate the aforementioned difliculties.

Another object of the invention is to provide a method of building abridge construction of the above character in which individual eyebarsare spaced laterally from each other as they are assembled into clustersto form eyebar assemblies for the cantilever span and then alignedvertically and longitudinally by the use of expanding mandrels.

Another object of the present invention is to provide a method ofbuilding a bridge construction of the above character in which theassembled eyebars are bound together to form a unitary assembly afterthey have been aligned.

Another object of the invention is to provide a method of building abridge construction of the above character in which the eyebar assemblyis lifted into position and the pins driven by the use of a jack.

Another object of the invention is to provide a method of building abridge construction of the above character in which the free end of theeyebar assembly is supported by tying it to the erected portion of thebridge span to permit erection of the other truss members adjacent thefree end of the eyebar assembly.

Additional objects and features of the invention will appear from thefollowing description in which the pre ferred embodiment has been setforth in detail in conjunction with the accompanying drawing.

Referring to the drawing:

Figure 1 is an elevational view of a typical cantilever span after ithas been completed.

Figure 2 is an enlarged side elevational view showing the progressiveerection of the anchor arm and the cantilever arm of the cantilever spanfrom one of the bridge piers by the balanced cantilever erection method.

Figure 3 is a plan view of the cantilever span shown in Figure 2.

Figure 4 is an enlarged cross sectional view taken along the line 4-4 ofFigure 2.

Figure 5 is a cross sectional view taken along the line 5-5 of Figure 4.

Figure 6 is a reduced partial plan view of the pin connection shown inFigure 5 but showing the pin in its final position.

Figure 7 is an enlarged cross sectional view taken along the line 7-7 ofFigure 5.

Figure 8 is a partial view of the pin with a permanent cap.

Figure 9 is a side elevational view of a typical eyebar assembly in theassembly yard or area. a

Figure 10 is a plan view of the eyebar assembly shown in Figure 9.

Figure 11 is an enlarged fragmentary side elevational view of the eyebarsupports.

Figure 12 is an enlarged cross sectional view taken along the line 12-12of Figure 9 and shows the eyebar supports.

Figure 13 is an enlarged cross sectional view taken along the line 13-13of Figure 9 and shows the mandrel in place but before it has beenexpanded.

Figure 14 is a partial cross sectional view similar to Figure 13 butshowing the mandrel in a fully expanded position.

Figure 15 is a side elevational view taken along the line 15-15 ofFigure 13.

Figure 16 is a cross sectional view taken along the line 16-16 of Figure13.

Figure 17 is a cross sectional view taken along the line 17-17 of Figure9 and shows a tightening and spacing assembly.

Figure 18 is a cross sectional view taken along the line 18-18 of Figure9 and shows the lifting assembly.

The method and apparatus I have used for the placement of eyebars incantilever bridge spans can best be understood by first giving a typicalerection sequence for a cantilever span. One method commonly used forerecting a cantilever span and often referred to as the BalancedCantilever Erection Method is shown in Figures 1, 2 and 3 of thedrawing. By this method an inclined shoring strut 11 is erected adjacentthe tower portion 12 of a pier 13. The initial bottom floor and chordsystem including a plumb post 14 is then erected. Stiff leg travelers 16and 17 are mounted in the completed portion and are used for completingthe anchor arm 18 and cantilever arm 19 by balancing one arm against theother as is well known to those skilled in the art. The same procedureis used for erecting anchor and cantilever arms from the next pier. Bothcantilever arms are then completed to close the span. Temporary shoringbents 21 may be used to support the anchor arms when the span betweenpiers is great.

The aforementioned method of erection of cantilever spans issubstantially conventional and hence is not given in detail. Myinvention is concerned primarily with the method and apparatus forassembling and erecting the eyebar assemblies 23 which form the upperchord members in the anchor and the cantilever arms. Even though thegeneral method of erecting the cantilever span is changed theinstallation of the eyebar assemblies will remain the same.

In accordance with my invention, I mount a plurality of elongate eyebars27 having eyes 28 at each end upon a suitable framework 29 such as shownin Figure 10. The framework consists of a pair of I-beams- 30 restingupon a relatively flat surface 31 as in an assembly yard or area. A pairof shorter I-beams 32 and 33 are mounted at right angles to and near theends of I-beams 30 and serve to carry a plurality of eyebar supports 34.

Each of the eyebar supports 34 consists of a pair of flat plate likemembers 36 fixed to a pair of right angle members 37 to form asubstantially U-shaped assembly. Each of the right angle members isprovided with suitable clamping means such as a bolt 38 and a pair ofnuts 39 for locking the eyebar supports 34 in position on the flanges 41of the I-beams 32 or 33.

The right angle members 37 are fastened to the plate like members 36 insuch a manner that the toe portions 42 are level and in alignment whenthe eyebar supports 34 are mounted upon the I-beams 32 and 33.

The eyebar supports 34 are mounted upon the I-beams 32 and 33 in apredetermined space relationship and the eyebars 27 are laid side byside in the eyebar supports 34 in a manner shown in Figure 10. One endof each of the eyebars is mounted flush against a backstop 43 which isfixed to one end of the channel members 29.

This serves to roughly align the eyebars in a longitudinal direction.

After the eyebars have been mounted in the eyebar supports 34 ashereinbefore described, a plurality of tightening and spacing assemblies46 are spaced longitudinally along the length of the assembled eyebars27. However, the tightening and spacing assemblies are not tightened atthis time. A typical tightening and spacing assembly 46 is shown inFigure 18 and consists of a plurality of spacing plates 47 of differentwidths and a plurality of spacing members 48 mounted upon a pair ofelongate bolts 49 and 51.

Each of the spacing members 48 consists of a pair of vertical plate likemembers 52 and 53 and a pair of horizontal bracing members 54 and 56connecting the opposite ends of the plate like members. A U-shaped rod57 is connected to the upper ends of the plate like members 52 and 53for a purpose hereinafter described.

In placing the tightening and spacing assemblies 46 upon the eyebarassembly, the spacing plates 47 and the spacing members 48 are firstmounted upon the upper elongate bolt 49 after which the spacing plates47 and the spacing members 48 are dropped down into the spaces betweenthe eyebars and then the lower bolt 51 is inserted. By utilizingdifferent widths of spacing plates 47 it is possible to properly spacethe eyebars.

Suitable means is provided for lifting the eyebar assembly and consistsof a lifting beam assembly 59 mounted midway between the ends of theeyebar assembly. Such a lifting beam assembly consists of a pair ofhorizontal channel members 61 and 62 which are connected to a pair ofvertical lifting members 63 and 64, the upper ends of the same beingprovided with openings 66 for the reception of books or the like. A pairof bolts 67 and 68 serve to secure the vertical lifting members 63 and64 to the eyebar assembly. A plurality of spacing plates 47 of variouswidths are mounted upon the bolts 67 and 68 and serve as spacing meansin a manner similar to that in the tightening and spacing assemblies 46.

A plurality of angular members 71 are spaced longitudinally of theeyebar assembly 23 and are fastened to the eyebars by clamps 72. Theangular members 71 form a permanent part of the cantilever span andserve as a support for a handrail (not shown).

After the tightening and spacing assemblies 46 and the lifting beamassembly 59 are in place, the eyes 28 in the eyebar assembly are readyfor alignment.

It is well known to those skilled in the art of bridge building that inmaking eyebars it is practically impossible to maintain exacttolerances. If the eyes 28 in the eyebars are out of alignment it willbe difficult to make the pin connection for connecting the eyebarassembly to the other bridge members. Therefore, I have found itdesirable to align the eyes in each eyebar assembly before the assemblyis lifted into place. To accom plish this I have provided expandingmandrels or pilot pin assemblies 77 which are adapted to be inserted inthe eyes 28 of the eyebar assembly.

Each pilot pin assembly 77 consists of a suitable number of segmentssuch as the four segments 78 shown in Figures 16 and 17. Each segmentcomprises an arcuate portion 79 and a pair of plate like portions 81 and82. The plate like portions 81 and 82 are fixed to the arcuate portion79 and extend radially therefrom to subtend an arc of degrees. Aplurality of reinforcing portions 83 are fixed to the arcuate portion 79and are spaced longitudinally along the length thereof. A beveled endportion 84 is fixed to the reinforcing portions 83 adjacent the oppositeends of the arcuate portion 79. Additional arcuate reinforcing portions86 serve to connect the outer ends of the plate like portions 31 and 82and are also fixed to the outer periphery of the arcuate reinforcingportions 83.

The segments 78 are connected into a cylindrical expanding-type mandrelby a plurality of bolts 87 mounted in holes 88 in the plate likeportions 81 and 82. The inner surfaces of the arcuate portions 79 areprovided with a pair of abutment members or shoulders 89. A U-bolt 91 ismounted in each end of each of the segments 78. The U-bolts are used forfacilitating withdrawal of the pilot pin assembly 77 from the eyes 28.

A hollow pipe-like member 93 is loosely mounted within the opening 94formed by the arcuate portions 79. It is provided with a pair ofenlarged tapered portions 96 and 97 for a purpose hereinafter described.A draw bar 98 is slidably mounted within the hollow pipelike member 93and is provided with a plurality of annular grooves 99 spacedlongitudinally thereof. The draw bar 93 is of a length that it extendssubstantially beyond both ends of the pipe-like member 93. A clamp o-ryoke 101 is mounted in one of the grooves 99 at one end of the draw bar.Suitable shimming means such as a pipe section 102 is mounted on thedraw bar and takes up substantially all of the play between the yoke 101and the adjacent end of the hollow pipe-like member 93.

Suitable means is mounted on the other end of the draw bar 98 forapplying a pulling force to the draw bar. One means found to besatisfactory consists of hydraulic ram 104 such as R6010 rammanufactured by Templeton, Kenly & Company of 16th and Gardner Road,Broadview, Illinois. The ram 104 is connected to a suitable fluid pump(not shown) by means of hydraulic lines 106 and 107. A yoke 108 similarto that shown in Figure 16 is mounted in one of the grooves 99 in theother end of the draw bar 98 adjacent the upper end of the ram 104. Adrive washer 109 is mounted on the draw bar 98 between the ram 14 andthe pilot pin assemblv 77.

Assuming that the bolts 87 are so adjusted that the segments 78 can beexpanded, the ram 104 may be operated to apply pulling force to the drawbar 98. This will cause movement of the draw bar to the right as shownin Figure 14 to cause the enlarged tapered portions 97 of the hollowpipe-like member to move into engagement with the abutment members orshoulders 89 on the segment 78. This will cause the segments 78 to beexpanded symmetrically in a radial direction to cause alignment of theeyes 28 in the eyebars by movement of the eyebars vertically andlongitudinally. Movement of the draw bar is continued until the largestportion of the enlarged tapered portion 97 engages the shoulders 89 asshown in Figure 15. Both of the pilot pin assemblies 77 are operatedsimultaneously so that the eyes on both ends of the eyebar assembly arealigned.

As soon as the pilot pin assemblies 77 have been moved to the fullyexpanded position, the tightening and spacing assemblies 46 are securedto maintain the eyebars in alignment. If desired, the pilot pin assembly'77 may be removed by operating the ram 104 to cause it to continue topull the hollow pipe-like member towards the ram until the enlargedtapered portions 97 no longer engage the shoulders 89. The'pilot pinassemblies may then be readily removed by grasping the U-bo'lts 91 anddrawing the assemblies from the eyes 28.

Normally, however only one of the pilot pin assemblies is removed in theyard and the other pilot pin assembly is not removed until a pin isdriven in the other end as hereinafter described.

After the eyebars 27 have been assembled into eyebar assemblies 23 andaligned as hereinbefore described they are loaded on suitable means suchas a barge 111 and moved to the erection site.

Let it be assumed that the erection of the cantilever span hasprogressed to the point shown in Figure 3 and that the vertical trussmember 112 and the last erected eyebar assembly 23, which will bedesignated as 113, are in the position shown. The following procedure isused for making the pin connection with the next eyebar assembly 23 tobe erected, which will be designated as 114, and the vertical trussmember 112, and theeyebar assembly 113. A suitable platform 116 isconnected to the upper portion of the vertical truss member 112. a

The platform 116 consists essentially of a bottom platform member 117connected to truss member 112..v A plurality of vertical members 118 andbracing members 119 are connected to the bottom platform member 117 andto a channel shaped member 121 which serves as a working surface for thepin 122 and the ram 123. A block 124 resting upon the member 121supports the ram in a position to drive the pin 122. A plurality of rods125 are mounted along the outer edges of the bottom platform member 117and form a rectangular enclosure to serve as safety or guide rails forthe platform;

The eyebar assembly 114 is lifted from the barge 111' by suitable meanssuch as the stifi leg derrick 16 which is connected to the lifting beamassembly 59. The'eyebar assembly 114 is then held in the position shownin Figure 2 so that one end is adjacent the upper end of truss member112 and the free end of eyebar assembly 113.

The upper end of the vertical truss member 112 is provided with aninclined bottom gusset plate 131. A pair of side gusset plates 132 and133 are fixed to the gusset plate 131 and are provided with a bore 134which is adapted to receive pin 122.

A pair of temporary erection supports 137 and 138 are mounted upon thebottom gusset plate 131 and serve as temporary supports for the adjacentends of the eyebar assemblies 113 and 114. The erection supports 137 and138 consist essentially of a prefabricated beam 139 in which the uppersurface 141 is inclined with respect to the other portions of the beam.The beam is connected to a plate 142 which is fastened by means of ahook bolt 143 to a channel member 144 secured to the bottom gusset plate131. A plurality of wooden wedges 146 (Figures 5 and 7) are used forcarrying the individual eyebars of the eyebar assembly upon thetemporary erection supports 137 and 138.

In making the pin connection between the vertical truss member 112 andthe eyebar assemblies 113 and 114, the free end of the eyebar assembly113 is lowered into place on top of the wedges 146 res-ting on thetemporary erection support 137 and upon wedges 147 immediately below thefree end of the eyebar assembly 113. The eyebar assembly 114 is loweredinto position so that the eyebars of assemblies 113 and 114 areinterleaved as shown in Figure 5 and eyebar assembly 114 is resting uponthe temporary erection support 138 and wedges 147.

If required, an additional stiffener plate 144 (Figure 7) may beinserted for strengthening the bottom gusset plate 131 to carry theweight of the eyebar assemblies 113 and 114 after they have been set inplace but before they have been pinned to the side gusset plates 132 and133.

The position of the Wedges 146 and 147 can be shifted to roughly alignthe eyes in the eyebar assemblies 113 and 114 withthe bore 134 in theside gusset plates .132 and 133. The pin 122 is lifted and placed uponthe channel shaped member 121 on the platform 116. The pin 122 isprovided with a bore 151 which is adaptcd'to receive the. draw bar 152having a plurality of grooves 153 spaced longitudinally along the lengththereof. A pilot nut 154 with .rounded corners is threaded on one endof-the pin .122 and facilitates initial insertion of the pin 122intobore 134. The draw bar 152 extends substantially beyond each end, of thepin 122 and extends through a member 156. A yoke or keeper 157 engagesone of the grooves 153 in the draw bar 152 and serves to prevent thedraw bar from being pulled through the member 156. The member 156 isprovided with a plurality of legs 158 which serve to space the member156 from the adjacent eyebar to provide a space which. is adapted toreceive the pilot nut 154 when the pin 122 is drawn to its finalposition.

The ram 123 is then mounted upon the .draw bar 152 adjacent a drive nut161 and is held in place by a,yoke .or keeper 162 engaging a groove 153in the draw bar.

The ram 123 is identical to ram 104 hereinbefore described and isoperated by a suitable fluid pump (not shown). Operation of the pumpcausesmovement of the ramplung er 163 to the right to cause the ram 123-to pull against the draw bar 152 to push the pin 122 into the bore 134and eyes 28. v If desired, the pin 122 may be greased to facilitatedriving of the pin 122. Since the stroke of the ram plunger is limited,it is necessary to drive the pin 122 in steps, the yoke 162 being movedto engage the next successive groove until the pin 122 is driven intoplace. Because the eyes in the eyebars have been previously aligned ashereinbefore described, thecap 164 (Figure 8) is put into place. Asimilar cap 165 is placed on the other end of the pin (Figure 6) tocomplete the pin connection between the vetrical truss member 112 andthe eyebar assemblies 113 and 114.

A top gusset plate 166 if such is provided in the design is then rivetedin place and the lateral truss members 167 are riveted to gussetextensions 168. The platform 116 may then be removed for use in makingthe next pin connection.

After the pin connection between the vertical truss member 112 and theeyebar assemblies 113 and 114 has been completed, the free end oftheeyebar assembly 114 is tied to the completed portion of the anchor armin a manner similar to that shown in the cantilever arm in Fig. 3 inwhich a suitable cable assembly 169 has one end connected to the freeend of an eyebar assembly 171 and the other end connected to apreviously completed pin connection 172.

The free end of the eyebar assembly 114 is maintained in this tied-backposition while the additional truss members shown in dotted lines inFigure 5 are erected. As soon as the vertical truss member representedby the dotted line 173 is erected, the free end of the eyebar assembly114 may be lowered to rest upon the vertical truss member represented bythe dotted line 173. The next eyebar assembly may then be raised by thestiff leg derrick 16 and one end of the eyebar assembly pinned to thefree end of the eyebar assembly 114 and the vertical truss memberrepresented by the dotted line 173, in a manner very similar to thathereinbefore described.

After both ends of the eyebar assembly 114 have been pinned, thetightening and spacing assemblies 46 may be loosened and removed bysuitable means. For example, they may be removed by a sling (not shown)connected to the stiff 'leg derrick 16 and by connecting the ends of thesling to the U-shaped rods 57 connected to the spacing members 48.

It is apparent that the eyebar assemblies for the-cantilever arm may beerected in a manner similar to that described for erecting the eyebarassembly 114 in the anchor arm. it is also apparent that the eyebarassemblies '23 previously erected in the anchor and cantilever armsprior to the erection of eyebar assembly 114 are also erected in asimilar manner. For example, in cornmencing the erection of thecantilever span, the plumb post 14 is erected on the tower 13. After afew of the other truss members have been erected in a manner Well knownto those skilled in the art of bridge building, the eyebar assemblies 23on eachside of the plumb post id are lifted by the stiff leg derricks'16 and 17, and one of the ends of each of the eyebar assembliesconnected to thep'lumb post 14 in a manner hereinbefore described.

It is apparent from the foregoing that l have provided a new method andapparatus for erecting eyebar assemblies used in forming the uppertension chords in the anchor and cantilever arms of a cantilever span.The use of pre-assemble'd and aligned eyebar assemblies greatlyfacilitates placement of the eyebar assemblies in the cantilever spanand makes possible a substantial saving in the cost of erection. I

Iclaim:

1. In a method for the construction of a cantilever span between twoadjacent bridge piers of the type wherei in the cantilever span haseyebars for tension members, the method comprising erecting a plumb poston one of said piers, erecting a plurality of truss members to form aportion of an anchor arm extending from one side and a portion of acantilever arm extending from the other side of said plumb post,assembling a plurality of said eyebars into a plurality of eyebarassemblies, aligning the eyes in said eyebar assemblies, securing theassembled eyebars into unitary eyebar assemblies to maintain thealignment of the eyes in the eyebar assemblies, lifting the eyebarassembly into a position adjacent one side of said plumb post, liftinganother eyebar assembly into a position adjacent the other side of saidplumb post, driving a pin through a bore in the plumb post the eyebarassemblies to form a connection between said plumb post and the ends ofthe two adjacent eyebar assemblies, erecting additional truss members inthe anchor and cantilever arms, lifting an eyebar assembly into aposition adjacent the free end of each of said eyebar assemblies havingone end connected to said plumb post, driving a pin to connect the freeend of each of the eyebar assemblies secured to said plumb post and theent of the eyebar assembly adjacent thereto to at least one of theerected truss members, erecting additionaltruss members and eyebar,assemblies to extend the anchor and the cantilever arms from said onepier, completing the same sequence of steps at the other pier, andcompleting the cantilever arms at each of said piers to close thecantilever span.

2. A method as in claim 1 which includes the step of supporting the freeend of each eyebar assembly after one end has been pinned by tying thefree end to a completed portion of the anchor and cantilever arms tosupport the free end above its normal position to facilitate theerection of the additional truss members to which the free end is to beconnected.

3. In a method for the construction of a cantilever span between twoadjacent bridge piers of the type Wherein the cantilever span haseyebars for tension members, the method comprising erecting a plumb poston one of said piers, erecting a plurality of truss members to form aportion of an anchor arm extending from one side and a portion of acantilever arm extending from the other side of said plumb post,assembling a plurality of said eyebars into a plurality of eyebarassemblies, aligning the eyes in said eyebar assemblies, securing theassembled eyebars into unitary eyebar assemblies to maintain thealignment of the eyes in the eyebar assemblies, lifting an eyebarassembly into a position adjacent one side of said plumb ipost, liftinganother eyebar assembly into a position adjacent'the other side of saidplumb post, mounting a platform on the upper portion of said plumb'post, lifting a pin and resting the pin upon said platform inahorizontal position, driving said pin into a bore in saidplumb post andthrough the eyes in said eyebars to form a connection-between said plumbpost and the ends of the two adjacent eyebar assemblies, erecting additional truss members in the anchor and cantilever arms, lifting aneyebar assembly into a position adjacent the free end of each of saideyebar assemblies having one end connected to said plumb post, mountinga platform on the upper portion of one of said truss members adjacentthe free ends of each of said eyebar assemblies connected to said plumbpost, lifting a pin and resting the pin upon each of said platforms in ahorizontal position, driving said pins into bores in said one trussmembers and through the eyes in said eyebars to connect the free ends ofthe eyebar assemblies secured to said plumb post and the ends of theeyebar assemblies adjacent thereto to said one truss memberserectingadditional truss members and eyebar. assemblies to extend theanchor'and cantilever arms from said plumb post, completing the samesequence of steps at theother pier, and completing the cantilever armsat each of the piers to close the cantilever span.

4. In a method for constructing eyebar assemblies upon a frameworkhaving a backstop, the method comprising assembling a plurality ofelongate eyebars sldeways in a predetermined space relationship uponsaid framework in such a manner that one of the ends of each of theeyebars is adjacent said backstop to roughly align said eyebars,inserting an expanding pilot pin assembly into the eyes at each end ofthe eyebars, expanding the pilot pin assemblies to align the eyebarsvertically and longitudinally and clamping the eyebars into a unitaryassembly whereby upon removal of said unitary assembly from saidframework said eyebars will remain in an aligned space relationship.

'5. In a method for constructing eyebar assemblies upon a frameworkhaving a backstop, the method comprising placing a plurality of eyebarsupports upon the framework in a predetermined spaced relationship,placing a plurality of eyebars in said supports with one of the ends ofeach of the eyebars being adjacent said backstop to roughly align theeyebars, loosely mounting a plurality of tightening and spacingassemblies on the assembled eyebars longitudinally of the eyebars,inserting an expanding pilot pin assembly into the eyes at each end ofthe eyebars, expanding the pilot pin assemblies to align the eyebars,and tightening the tightening and spacing assemblies to clamp theeyebars into a unitary assembly whereby upon removal of said unitaryassembly from said framework and said eyebar supports, said eyebars willremain in an aligned spaced relationship.

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